JPH0352799Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a reinforcing device for a threaded rod in a screw jack.

BACKGROUND TECHNOLOGY Conventionally, in a commonly used screw jack, a predetermined gap is provided between the intermediate threaded cylinder and the outer cylinder for the passage of the ram, and the intermediate screw cylinder is raised. In this case, the threaded rod looks like an elongated threaded rod, with no support of any kind in the middle.

Problems that the invention aims to solve As mentioned above, in conventional screw jacks, when the intermediate threaded cylinder is raised, the threaded rod becomes like an elongated threaded rod, and there is no support in the middle. Therefore, when using jacks, irregular loads may be applied to the threaded rod, such as lateral movement of cargo in the case of automobiles,
If an unexpected load is applied to the threaded rod due to the tilt of the car body, etc.
The disadvantage is that the threaded rod will bend and the jack will no longer work.

The purpose of this proposal is to provide a screwdriver that can overcome this drawback.

Means to solve the problem A threaded rod with its lower end fixed to the bevel gear is installed upright in the center of the inside of the jack body, and a female screw provided inside the lower part of the intermediate threaded cylinder is fitted onto this threaded rod. Then, the female screw part provided inside the lower end of the ram is screwed into the outer circumferential thread part of the intermediate threaded cylinder, and the lower end of the outer cylinder surrounding the outside of the intermediate threaded cylinder is screwed, leaving a passage for the ram to ascend and descend. In the screw jack that fits into the upper end opening of the main body, fit the bush onto the outer periphery of the lower end of the intermediate threaded cylinder, integrate it with the intermediate threaded cylinder with a fixing pin, and insert the surrounding groove provided on the outer periphery of the bush. A ring is fitted into the outer cylinder, and the ring is also fitted into a surrounding groove provided on the inner surface of the outer cylinder, so that the bush can be rotated along a predetermined position on the inner surface of the outer cylinder through this ring. A screw jack reinforcement device is characterized by the following.

Function Since the present invention is constructed as described above, when the intermediate threaded cylinder 4, ram 6, and outer cylinder 8 are extended as shown in FIG. 8 and supports the threaded rod 3 via the intermediate threaded cylinder 4, thereby reinforcing the threaded rod 3.

Embodiment The drawing shows an embodiment of the present invention. 1 is a jack body, and the lower end is a bevel gear 2 in the inner center.
A threaded rod 3 fixed to the ram 6 is erected, and a female thread 5 provided inside the lower part of the intermediate threaded cylinder 4 is screwed to this screw rod, and the lower end of the ram 6 is attached to the outer threaded part of the intermediate threaded cylinder 4. The lower end of the outer cylinder 8 that surrounds the outside of the intermediate screw cylinder 4 while leaving a passage for the ram 6 is fitted into the upper end opening of the jack main body, and the lower end of the intermediate screw cylinder 4 is screwed together. After fitting the bush 9 to the outer periphery and integrating it with the intermediate threaded cylinder using the fixing pin 10, the outer opening ring 12 is contracted and fitted into the surrounding groove 11 provided on the outer periphery of the bush 9. is inserted into the inner surface of the outer cylinder 8, and the inner part is fitted into the surrounding groove 13 provided on the inner surface of the outer cylinder 8, and the inner part is fitted into the surrounding groove 11 of the bush 9. Through this ring 12, the bush 9 is removed from the outside. It is a connecting device so that it can rotate along a fixed position on the inner surface of the cylinder 8.

Effect Since the present invention is constructed as described above, when the intermediate threaded cylinder 4, ram 6, and outer cylinder 8 are extended as shown in FIG. 8 and supports the threaded rod 3 via the intermediate threaded cylinder 4, thereby reinforcing the threaded rod. And Butsuyu 9
Since the ring 12 is fitted into both the surrounding groove 11 provided on the outer periphery of the outer cylinder 8 and the surrounding groove 13 provided on the inner surface of the outer cylinder 8, the intermediate threaded cylinder 4, which does not rotate, can be lowered or raised by the rotating threaded rod 3. When the intermediate threaded cylinder 4 and the outer cylinder 8 are moved vertically, they can be lowered or raised together, and then lowered to the lower end of the threaded rod 3 relative to the intermediate threaded cylinder 4. When the threaded rod 3 is connected to the upper surface of the bevel gear 2, or the upper end of the threaded rod 3 is connected to the inner bottom of the intermediate threaded cylinder 4, the rotation of the threaded rod 3 is transmitted to the intermediate threaded cylinder 4, and the two rotate as one. At the same time, the threaded rod 3 is rotatably connected to the outer cylinder 8 at the same position to ensure the rotation of the threaded rod 3 and to tightly connect the outer cylinder 8 and the threaded rod 3 to eliminate play. Therefore, it is intended to eliminate swinging especially near the maximum extension of the jack. Therefore, the outer cylinder 8 is vertically movable with respect to the intermediate threaded cylinder 4 and is rotatably connected to the intermediate screw cylinder 4.

From the above, even if an unexpected irregular load is applied to the threaded rod, the threaded rod will be supported by the jack body via the bushing, the threaded rod will be reinforced, and there will be no fear of it bending.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of the jack when it is extended, FIG. 2 is a perspective view of the bushing, and FIG. 3 is a perspective view of the ring. DESCRIPTION OF SYMBOLS 1... Jacket body, 3... Threaded rod, 4... Intermediate threaded tube, 6... Ram, 8... Outer cylinder, 9... Bush, 11... Surrounding groove, 12... Ring, 13...
...surrounding ditch.

Claims (1)

[Scope of utility model registration request] At the inner center of the jack body 1, attach the lower end to the bevel gear 2.
A threaded rod 3 fixed to the screw rod 3 is set upright, and a female screw 5 provided inside the lower part of the intermediate threaded cylinder 4 is screwed onto this screw rod 3.
The lower end of the outer cylinder 6 that surrounds the outside of the intermediate threaded cylinder 4 is fitted into the upper end opening of the jack main body 1, leaving a passage for the ram 6 to move up and down. In the screwdriver, the bush 9 is fitted to the outer periphery of the lower end of the intermediate threaded cylinder 4, and is integrated with the intermediate threaded cylinder 4 using the fixing pin 10.
A ring 12 is fitted into a surrounding groove 11 provided on the outer periphery of the bush 9. This ring 12 is also fitted into a surrounding groove 13 provided on the inner surface of the outer cylinder 8, and the bush 9 is inserted through this ring 12. A reinforcing device for a screw jack, characterized in that the device is configured to be able to rotate along a predetermined position on the inner surface of an outer cylinder 8.